Dear sir,
I have the same problem, I can’t import activities in P6 from excel file. What I observed. If I create only one activity in my WBS’s project (in P6) and I export this activity to an excel file (spreadsheet file XLSX) and after export, I delete created activity from P6 and then I try to import deleted activity from excel file to P6 (without doing any changes in the exported excel file from P6) I receive an error message “ERROR: target_end_date is null for TASK ActivityID: A1000, Project: 5R1”.
I mention that I didn’t export any start and finish column in my excel file.
Which can be the error?
Thank you in advance,
Stefan